Event.observe ( window, 'load', bootstrap_navigation );

function bootstrap_navigation () {
  $( 'isock_navigation_root' ).immediateDescendants ().each ( function ( child ) {
    Event.observe ( child, 'mouseover', function ( event ) { child.addClassName    ( 'shown' ); } );
    Event.observe ( child, 'mouseout',  function ( event ) { child.removeClassName ( 'shown' ); } );
  });
}
